Emotet Office (OLE) / .XLSX malware analysis — malicious · 8367f873c806ac8d

MALICIOUS

Office (OLE) / .XLSX

141.5 KB Created: 2022-01-19 09:31:16 Authoring application: Microsoft Excel

MD5: 8614f257048222da423e77b3eb2dbf02 SHA-1: cd10af0d741df96c84f440d39a963eac73f22bac SHA-256: 8367f873c806ac8d56f4ddb2f158e4d559c67dc1d7b66ac3221cd28a2c8079f9

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. ClamAV detection further confirms this, identifying it as 'Doc.Downloader.EmotetExcel01220-9936774-0'. The presence of Auto_Open macros strongly suggests the document is designed to execute arbitrary code upon opening, typically to download and run a secondary payload. The document body content appears to be a lure, disguised as a blood pressure tracker.

Heuristics 3

Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
ClamAV: Doc.Downloader.EmotetExcel01220-9936774-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel01220-9936774-0
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `592af8991900f2f7058dc7ea90a33320ae293c7e541db4222a7b7f9c04f59d96`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8469 bytes

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